I think that Lucas probably had a vague idea that he'd like to have the story visit Tatooine again in the future. But he also was of course basing that on not knowing yet whether he'd get to make those future movies, before seeing if Star Wars (ANH) was going to be successful or not.

I always liked the ironic similarities between:
ANH
Obi-Wan: You'll have to sell your speeder.
Luke: That's okay. I'm never coming back to this planet again.

and

ROTJ
Luke: There's nothing to see. I used to live here, you know.
Han: You're gonna die here, you know. Convenient.

I can't say if Lucas knew (but he probably had a feeling that Luke's adventures would bring him back and that Luke was being naive by saying this), but I would guess that Lucas didn't have ESB and ROTJ mapped out in enough detail yet to have planned the return to Tatooine and Jabba's Palace and so forth.

"I'll never return to this planet again" works either way (whether or not Luke ever comes back), but of course it's better with the irony of knowing where ROTJ takes things.

I don't think knowing whether or not the story would take them back there would impact the dialogue. Luke couldn't wait to get out of there and when his family was killed, he couldn't imagine any reason he would "want" to come back. In Jedi, he certainly wasn't there on a pleasure cruise, he had to rescue a friend.

Luke Skywalker was so relieved to be leaving Tatooine that he didn't care under what circumstances that he would be leaving. If Han never had bad business with Jabba The Hutt, and if Boba Fett didn't take him there, then Luke would have still never returned to Tatooine.

At the time he said it, I'm pretty sure he was not planning to ever go back. Of course, it's good that he did, else he would never have found Kenobi's notes on lightsaber construction.

Anikin never planned to return, either, after Shmi died. But he ended up returning as well, even though he never went down to the surface. It really annoyed him, hence his show of rage aboard the Tantive IV. He slaughtered everyone on board except Leia.

Anikin never planned to return, either, after Shmi died. But he ended up returning as well, even though he never went down to the surface. It really annoyed him, hence his show of rage aboard the Tantive IV. He slaughtered everyone on board except Leia.

Hardly intentional, but there's actually a couple of lines in the 1981 SW Radio Drama which have an eerie resonance:

VADER: What I don't understand is why she came here, to this miserable dustball of a planet.

VADER: So, she must have hidden the plans in that pod. I want the pod located and the plans retrieved. See to it personally Commander.
I want them found, even it means tearing apart, bit by bit, this miserable speck of a planet... this Tatooine!

At the time he said it, I'm pretty sure he was not planning to ever go back. Of course, it's good that he did, else he would never have found Kenobi's notes on lightsaber construction.

Anikin never planned to return, either, after Shmi died. But he ended up returning as well, even though he never went down to the surface. It really annoyed him, hence his show of rage aboard the Tantive IV. He slaughtered everyone on board except Leia.

Anakin didn't choke antilles on the tantine iv because he was angry at the sandpeople from episode 2. Huh?

What evidence is there he was. I love the opening of a new hope. It shows anakin, now darth vader, first meeting his daughter and visiting a planet with childhood memories. Underneath his face is an older, burned, pale bald, hayden christensen. We now know what that face in ESB and ROTJ looked like! Watching the originals is 100x better now that we have the prequels. Leia was also above her father's homeplanet at that point.

Lord Tyranus: Just because you do not count the EU as canon does not mean you can refute it when it's another person's opinion. I have warned you repeatedly. This is your final warning. Do it again and I am going to ban you.

Lord Tyrannus, I'm not sure there's "different canons" as you put it. There's different LEVELS of canon, which means that certain things (movies - top rank) outrank other canon in case of conflict, but all is canon. Officially.

Personally, you are free to accept bits and pieces as your own personal canon and discard the rest.

In our discussions on the boards, here in MOVIES the movies of course take precedence, but EU can be used to illustrate your point (not invalidate anything IN the movies). Personally, I detest a lot of EU but I accept a lot as well. I'm not upset that TCW (the TV show) overwrites some of EU because most of that EU I personally don't care for. But unless a higher LEVEL of canon disqualifies something prior, it is valid to cite the EU to support a position.

I'm not an expert on the canon levels; any discussion of that is best elsewhere on the boards.